S
M
T
W
T
F
S
29
27°
15°
30
33°
17°
1
31°
19°
2
29°
21°
3
32°
22°
4
33°
20°
5
32°
21°
6
31°
12°
7
32°
20°
8
29°
19°
9
33°
17°
10
33°
20°
11
30°
19°
12
34°
18°
13
32°
25°
14
34°
22°
15
34°
25°
16
33°
26°
17
36°
27°
18
40°
23°
19
41°
19°
20
35°
16°
21
30°
10°
22
28°
13°
23
27°
11°
24
26°
9°
25
27°
10°
26
28°
8°
27
23°
13°
28
23°
10°
29
26°
4°
30
26°
8°
31
18°
11°
1
22°
21°
2
30°
18°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in Trinity Valley
Trinity Valley's December 2026 forecast shows daily high temperatures ranging from 18° to 41°, with overnight lows between 4° and 27°. The average high for December is 30° with an average low of 17°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how December weather will actually feel in Trinity Valley. See also: January | February | March.
